Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4684717472bc3a…

MALICIOUS

PDF

77.2 KB Created: 2021-02-18 04:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bc838710a1edc40e1cfd48609886eae1 SHA-1: b74f2b02b9756a9463fe2303dfeadf84e183179d SHA-256: ec4684717472bc3a0c79dfa889ed3b4e482b8a88eff2333e56d386770b266f4b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/aws?utm_term=what+makes+you+a+good+student+essay PDF link annotation
    • https://pixerogamaba.weebly.com/uploads/1/3/1/8/131871590/4174589.pdfIn PDF document text
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/fb10e13eb1c.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/hXSjdhc/neon_air_hockey_table.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/h2ZUvCV/animal_jam_play_wild_member_gifts.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/gfd9ggX/how_to_use_activity_launcher_app.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/jjjfjjt/mepalunakusure.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuwomu/4zvjahb/pudamej.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/idjegdI/macbook_pro_lock_screen_shortcut_2019.pdfIn PDF document text
    • http://bizelapeto.iblogger.org/gaximerusepali.pdfIn PDF document text
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/8095762.pdfIn PDF document text
    • https://cdn.sqhk.co/sebudesusoj/SvMVh0v/9060751859.pdfIn PDF document text
    • https://bemakidej.weebly.com/uploads/1/3/0/7/130739127/5faea6aa.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/eM2q7MH/hmrc_self_employed_grant_august.pdfIn PDF document text
    • https://titerafutar.weebly.com/uploads/1/3/0/7/130775646/3594813.pdfIn PDF document text
    • https://jowetirepenu.weebly.com/uploads/1/3/1/3/131383619/3210537.pdfIn PDF document text
    • https://cdn.sqhk.co/tezasevimab/gf63wha/pelinoliraxed.pdfIn PDF document text
    • https://zenavepofiwu.weebly.com/uploads/1/3/1/6/131607810/3bcde8f51dfc97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://joxesovifelerav.epizy.com/goxuni.pdfIn PDF document text
    • http://forarit.epizy.com/compound_sentences_worksheet_for_grade_7.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 5124 bytes
SHA-256: 1d7e67e2f817880076d4ba4671ab3d8dd554c271df99fb284d85812fdff0f935
font_01_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 10316 bytes
SHA-256: 2f2c22b8305547f6696ae6023bec8c5429bc21205495be8664f6e4352103a522
font_02_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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